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  • C08F14/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
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  • C08F14/26—Tetrafluoroethene
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  • B01J23/20—Vanadium, niobium or tantalum
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  • B01J23/32—Manganese, technetium or rhenium
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  • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
  • B01J23/32—Manganese, technetium or rhenium
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  • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
  • B01J23/42—Platinum
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  • B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
  • B01J23/40—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals of the platinum group metals
  • B01J23/46—Ruthenium, rhodium, osmium or iridium
  • B01J23/462—Ruthenium
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
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  • B01J23/48—Silver or gold
  • B01J23/50—Silver
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P20/00—Technologies relating to chemical industry
  • Y02P20/50—Improvements relating to the production of bulk chemicals
  • Y02P20/584—Recycling of catalysts

Definitions

• the present invention relates to a method for producing a mixture of fluoroalkyl iodides.
• Such a telomerization reaction is performed by sequentially reacting 1-iodoperfluoroethane (C 2 F 5 I), which is a telogen, and tetrafluoroethylene, which is a taxogen, in a reactor.
• Patent Document 1 discloses that in a reaction apparatus in which a catalyst exists, the formula R f -I as a telogen (wherein R f is a fluoroalkyl group having 1 to 6 carbon atoms) and a taxogen as a taxogen.
• R f — (CF 2 CF 2 ) n —I By telomerization reaction with tetrafluoroethylene, R f — (CF 2 CF 2 ) n —I (wherein R f is a fluoroalkyl group having 1 to 6 carbon atoms, and n is an integer of 1 to 4)
• a method for producing a fluoroalkyl iodide represented by formula (1) is disclosed.
• Such a method is also an excellent method, but there is room for improvement in the selectivity of the fluoroalkyl iodide produced. That is, since the above telomerization reaction is a sequential reaction, the reaction of 1-iodoperfluoroethane (C 2 F 5 I) and tetrafluoroethylene proceeds in the reactor at the same time as the above formula. Reaction of telogen with n of 1 or more and tetrafluoroethylene also proceeds.
• the reaction between 1-iodoperfluoroethane (C 2 F 5 I) and tetrafluoroethylene is a rate-determining step because the reaction rate is slow.
• 1-iodoperfluoroethane (C 2 F 5 I) and tetrafluoroethylene are reacted with each other to produce 1-iodoperfluorobutane (C 4 F 9 I).
• Fluorobutane (C 4 F 9 I) reacts with tetrafluoroethylene in the reactor and the reaction proceeds sequentially one after another.
• the target fluoroalkyl iodide is 1-iodoperfluorohexane (C 6 F 13 I)
• many fluoroalkyl iodides having more carbon atoms than 1-iodoperfluorohexane (C 6 F 13 I) are produced, and selection of the desired fluoroalkyl iodide There is a problem that the rate decreases.
• An object of the present invention is to provide a novel method for producing a mixture of fluoroalkyl iodides that is capable of producing a target fluoroalkyl iodide with high selectivity and that is excellent in production efficiency. .
• a second fraction comprising a fluoroalkyl iodide of formula (I) and having a degree of polymerization n of (m-1), and Separating into a third fraction comprising a mixture of fluoroalkyl iodides of formula (I)
• this invention relates to the manufacturing method which manufactures the mixture of the following fluoroalkyl iodide by a telomerization reaction.
• the following formula (I) R f (CF 2 CF 2 ) n I (I) (In the formula, R f represents a fluoroalkyl group having 1 to 10 carbon atoms, and n is an integer indicating the degree of polymerization.) Wherein the polymerization degree n is m (where m represents an integer of 2 or more) or more, and a mixture of fluoroalkyl iodides is produced by a telomerization reaction, (1) In the first reactor in which the metal catalyst is present, the following formula (II) R f I (II) (In the formula, R f represents a fluoroalkyl group having 1 to 10 carbon atoms.) Is reacted with tetrafluoroethylene to obtain a first reaction mixture containing a mixture of
• Step 1 and (2) The first reaction mixture extracted from the first reactor, A first fraction comprising a fluoroalkyl iodide or a mixture thereof represented by the formula (I) and having a polymerization degree n of (m-2) or less, a fluoroalkyl iodide represented by the formula (II), and tetrafluoroethylene , A second fraction comprising a fluoroalkyl iodide of formula (I) and having a degree of polymerization n of (m-1), and Separating into a third fraction comprising a mixture of fluoroalkyl iodides of formula (I) and having a degree of polymerization n greater than or equal to m; (3) The second fraction is transferred to a second reactor in which a metal catalyst is present, and reacted with tetrafluoroethylene in the second reactor, whereby the degree of polymerization n is represented by the formula (I).
• a second reaction mixture comprising a mixture of fluoroalkyl iodides as described above, and The manufacturing method characterized by the above-mentioned. 2. Wherein it is R f is C 2 F 5 in formula (I), n to produce a mixture of fluoroalkyl iodide is 2 or more, the production method according to 1. 3. In the step 1, the first fraction separated in the step 2 is returned to the first reactor so that the degree of polymerization n is 1 or less (m ⁇ 2). Item 3.
• the method according to Item 1 or 2 comprising supplying one or more fluoroalkyl iodides and tetrafluoroethylene, and reacting the one or more fluoroalkyl iodides with tetrafluoroethylene.
• Production method. 4 The second reaction mixture obtained in step 3 is A fluoroalkyl iodide of the formula (I) having a polymerization degree n of (m-1) or less or a mixture thereof, and a fourth fraction containing tetrafluoroethylene, A fifth fraction comprising a fluoroalkyl iodide of formula (I) and having a degree of polymerization n of m, and Item 4.
• a cycle for obtaining the fifth fraction, which is a fraction of the next stage, is defined as one cycle, and the next stage fraction obtained in the cycle is further
• item 4 which repeats the said cycle p times (p represents an integer greater than or equal to 1) by performing the same process as said process 3 and said process 4. 7).
• the metal catalyst is at least one selected from the group consisting of copper, zinc, magnesium, vanadium, rhenium, rhodium, ruthenium, platinum, silver, and a substance obtained by adding a small amount of a transition metal to these metals. 7.
• the production method of the present invention comprises the following formula (I) in a reactor in which a metal catalyst is present.
• R f (CF 2 CF 2 ) n I (I) (In the formula, R f represents a fluoroalkyl group having 1 to 10 carbon atoms, and n represents an integer indicating the degree of polymerization.) Wherein n is m (m represents an integer of 2 or more) or more, and a mixture of fluoroalkyl iodides is produced by a telomerization reaction, (1)
• the following formula (II) R f I (II) (In the formula, R f represents a fluoroalkyl group having 1 to 10 carbon atoms.)
• the production method of the present invention comprises a plurality of reactors, and the reaction of 1-iodoperfluoroethane (C 2 F 5 I) and tetrafluoroethylene, which has a slow reaction rate in the first reactor, is performed.
• the ratio of the fluoroalkyl iodide having a high polymerization degree n in the first reaction mixture in the first reactor can be reduced.
• the second reactor as in the process of obtaining 1-iodoperfluorohexane (C 6 F 13 I) by reacting 1-iodoperfluorobutane (C 4 F 9 I) with tetrafluoroethylene.
• a telomerization reaction using a fluoroalkyl iodide having a polymerization degree n of 1 or more as a raw material, which is faster than the reaction performed in the first reactor, can be performed. Therefore, a telomerization reaction using a fluoroalkyl iodide having a high reaction rate and a polymerization degree n of 1 or more as a raw material can be performed independently of the reaction in the first reactor having a low reaction rate.
• the time can be adjusted appropriately, and the selectivity of the target fluoroalkyl iodide such as 1-iodoperfluorohexane (C 6 F 13 I) can be increased.
• the present invention relates to a fluoropolymer obtained by a telomerization reaction using 1-iodoperfluoroethane (C 2 F 5 I) as a telogen and tetrafluoroethylene (sometimes abbreviated as “TFE” in this specification) as a taxogen.
• Fluoroalkyl iodide specifically, a mixture of alkyl iodides C 2 F 5 (CF 2 CF 2 ) n I (n is an integer indicating a polymerization degree) having a polymerization degree n of 2 or more.
• the fluoroalkyl iodide produced by the production method of the present invention is a compound represented by the above formula (I).
• R f represents any one of fluoroalkyl groups having 1 to 10 carbon atoms.
• R f corresponds to the fluoroalkyl group of the fluoroalkyl iodide that is the starting material for the telomerization reaction.
• the mixture of fluoroalkyl iodides means a mixture containing a plurality of fluoroalkyl iodides having different polymerization degrees n.
• the object to be produced by the production method of the present invention is a mixture of fluoroalkyl iodides having a polymerization degree n of m or more.
• This mixture is a mixture of fluoroalkyl iodides having polymerization degrees n of m, m + 1, m + 2,.
• this mixture may inevitably contain a fluoroalkyl iodide with n smaller than m, an unreacted fluoroalkyl iodide, and the like depending on the separation conditions of the reaction mixture. It should be noted that mixtures containing these inevitably contained compounds are also included in the object to be produced by the production method of the present invention.
• the degree of polymerization n of the fluoroalkyl iodide or the mixture thereof represented by the above formula (I) and having a polymerization degree n of (m ⁇ 2) or less is 0.
• the compound represented by the formula (I) is a fluoroalkyl iodide represented by R f I.
• n is an integer of 1 selected from an integer of 2 or more, and is selected as desired according to the use of the fluoroalkyl iodide.
• the polymerization degree n max of the fluoroalkyl iodide having the maximum degree of polymerization varies depending on the conditions of the telomerization reaction. In general, n max is about 20.
• the mixture obtained by the production method of the present invention preferably contains the most fluoroalkyl iodide having a polymerization degree n of m.
• the method for producing a mixture of fluoroalkyl iodides of the present invention uses two reactors, and in the first reactor, the formula R f I (wherein R f is a fluoroalkyl having 1 to 10 carbon atoms)
• R f is a fluoroalkyl having 1 to 10 carbon atoms
• a fluoroalkyl iodide having a polymerization degree n of (m-1) is obtained by reacting TFE with a fluoroalkyl iodide represented by any one of the following groups: And is reacted with TFE in a second reactor.
• the proportion of the fluoroalkyl iodide having a polymerization degree of m in the product that is, a mixture of fluoroalkyl iodides having a polymerization degree n of m or more
• the proportion of the fluoroalkyl iodide having a polymerization degree of m in the product that is, a mixture of fluoroalkyl iodides having a polymerization degree n of m or more
• both the first and second reactors are not limited to those having a specific shape or the like, and any reactor (for example, an autoclave) conventionally employed for telomerization reaction may be arbitrarily used. Can be used. Moreover, the manufacturing method of this invention can be implemented by simple operation.
• Metal catalyst For example, a metal catalyst having a predetermined quality and quantity is introduced into the reactor before starting the reaction.
• the amount of the metal catalyst introduced is preferably 0.001 to 1 mole relative to 1 mole of fluoroalkyl iodide (R f I) in the first reactor and the second reactor.
• the catalyst particles When the metal catalyst is copper powder, the catalyst particles have a particle diameter of 0.1 ⁇ m to 1 mm, preferably 20 ⁇ m to 0.3 mm, and an average particle diameter of 20 ⁇ m to 200 ⁇ m, preferably 45 ⁇ m to 100 ⁇ m. Is used.
• the particle form is not particularly limited, and the form of particles obtained by physically processing a copper lump such as cutting or pulverization, and electrical and / or chemical deposition from an electrolyte containing copper ions. It may be in various forms such as the form of the particles obtained.
• a copper powder for example, a copper powder called primary copper powder 325 mesh that is commercially available as a reagent from Kishida Chemical Co., Ltd. can be used.
• the metal catalyst other metal substances that substantially exhibit a catalytic action for the telomerization reaction to be carried out in the present invention can be used.
• a material include zinc, magnesium, vanadium, rhenium, rhodium, ruthenium, platinum, silver, or a material obtained by adding a small amount of a transition metal to these metals, for example, an alloy having such a composition.
• the mixture of copper powder and these substances can also be used as a catalyst.
• substances other than copper powder as a catalyst and also when using a mixture of a substance other than copper powder and copper powder as a catalyst, it has the particle diameter and average particle diameter as described above for copper powder. It is necessary.
• Step 1 is a step for carrying out the telomerization reaction in the first reactor in which the metal catalyst is present.
• the telomerization reaction has the formula (II) R f I (II) This is carried out by reacting the fluoroalkyl iodide represented by the formula (II) with TFE.
• R f is any one of fluoroalkyl groups having 1 to 10 carbon atoms.
• R f is preferably any one of fluoroalkyl groups having 1 to 8 carbon atoms, more preferably any one of fluoroalkyl groups having 1 to 5 carbon atoms, Preferably, it is a fluoroalkyl group having 2 carbon atoms.
• Examples of the fluoroalkyl iodide represented by the above formula (II) include iodotrifluoromethane (CF 3 I), 1-iodoperfluoroethane (C 2 F 5 I), 2-iodoperfluoropropane (CF 3 CFICF). 3 ), and 1-iodoperfluorobutane (C 4 F 9 I). Of these, 1-iodoperfluoroethane (C 2 F 5 I) is commonly used in the telomerization reaction of TFE. 1-iodoperfluoroethane (C 2 F 5 I) is also preferably used in the production method of the present invention.
• the telomerization reaction may be performed under conditions conventionally employed in the production of fluoroalkyl iodides. Specifically, the reaction is allowed to proceed at a reaction temperature of 30 to 150 ° C. and a reaction pressure of 0.01 to 2 MPa. The reaction time is generally 0.1 to 10 hours.
• the reaction pressure is the pressure generated by the injecting TFE.
• the specific pressure shown above is a gauge pressure. In the present specification including the following explanation, the pressure is expressed in gauge pressure unless otherwise specified.
• the molar ratio of the fluoroalkyl iodide (R f I) represented by the above formula (II) and tetrafluoroethylene (TFE) is preferably 20:80 to 99: 1.
• the larger the R f I / TFE ie, the smaller the TFE molar ratio
• R f I 1-iodoperfluoroethane
• R f I TFE
• TFE can be charged into the gas phase portion of the reactor, or may be charged so as to generate bubbles in the liquid phase R f I.
• the fluoroalkyl iodide in which n is (m-2) or less may be obtained, for example, by separating the first reaction mixture in Step 2 described later. That is, supplying one or more fluoroalkyl iodides where n is (m ⁇ 2) or less may be performed by returning a part of the first reaction mixture. In this case, by returning the first fraction separated in Step 2 described later to the first reactor, one or more kinds represented by the above formula (I) and having a polymerization degree n of (m-2) or less are used.
• the fluoroalkyl iodide and tetrafluoroethylene are supplied, and the one or more kinds of fluoroalkyl iodide and tetrafluoroethylene are reacted.
• the fluoroalkyl iodide whose n supplied to the first reactor is (m ⁇ 2) or less is not necessarily obtained by the telomerization reaction of R f I and TFE. Any compound obtained by a method other than the telomerization reaction may be supplied to the first reactor as long as it is a compound represented by the formula (I) and having a structure in which n is (m-2) or less. Although such compounds may not be strictly called fluoroalkyl iodides, such compounds are also referred to herein as fluoroalkyl iodides for convenience.
• Step 2 is a step of separating the first reaction mixture obtained in Step 1 and containing a mixture of fluoroalkyl iodides having a degree of polymerization n of 1 or more into three fractions each containing the above components.
• a mixture of fluoroalkyl iodides having a degree of polymerization n of 1 or more into three fractions each containing the above components.
• other components for example, fluoroalkyl iodides to be contained in other fractions
• Such other components may inevitably be included depending on the performance and operating conditions of the apparatus used for the separation.
• each fraction will be described.
• the first fraction is represented by the formula (I), a low-polymerization degree fluoroalkyl iodide having a polymerization degree n of (m-2) or less, or a mixture thereof, an unreacted fluoroalkyliodine represented by the formula R f I Including dyes and tetrafluoroethylene.
• the first fraction contains unreacted TFE in the form of a gas phase and / or a liquid phase.
• the first fraction is preferably returned to the first reactor from the viewpoint of production efficiency.
• a fluoroalkyl iodide having a polymerization degree n of (m ⁇ 2) or less or a mixture thereof refers to one or more fluoroalkyl iodides having a value of (m ⁇ 2) or less depending on the value of m. It means that it may become.
• m 2
• the first fraction includes fluoroalkyl iodide, R f I, and TFE having a degree of polymerization n of (m ⁇ 2) or less, as well as other components such as fluoro having a degree of polymerization n greater than (m ⁇ 2).
• Alkyl iodides may be included.
• Such other components may be unavoidably included in the first fraction depending on the performance of the separation device as described above.
• the amount of the other component contained in the first fraction is preferably as small as possible (for example, 0.1 mol% or less).
• the second fraction contains a fluoroalkyl iodide represented by the formula (I) and having a polymerization degree n of (m ⁇ 1).
• the second fraction is subjected to a telomerization reaction in Step 3 described later.
• the second fraction contains, in addition to the fluoroalkyl iodide having a polymerization degree n of (m ⁇ 1), other components such as a fluoroalkyl iodide having a polymerization degree n smaller than or greater than (m ⁇ 1). Good.
• Such other components may be inevitably contained in the second fraction, depending on the performance of the separation device as described above.
• the amount of the other component contained in the second fraction is preferably as small as possible (for example, 0.1 mol% or less).
• the third fraction contains a mixture of fluoroalkyl iodides represented by the formula (I) and having a polymerization degree n of m or more.
• the third fraction is removed as the desired product.
• the third fraction may contain other components, for example, a fluoroalkyl iodide having a polymerization degree n of (m ⁇ 1) or less, in addition to the fluoroalkyl iodide having a polymerization degree n of m or more.
• Such other components may be inevitably contained in the third fraction depending on the performance of the separation device as described above.
• the amount of the other component contained in the third fraction is preferably as small as possible (for example, 0.1 mol% or less).
• each fraction may be separated simultaneously in one separator.
• step 2 may be performed in two stages. That is, the first reaction mixture is separated into a first fraction and an intermediate fraction including the second and third fractions, and the intermediate fraction is separated into a second fraction and a third fraction in a separate separator. Step 2 may be performed.
• Step 2 is preferably performed using a distillation column.
• the distillation column may be a plate column or a packed column.
• step 2 is carried out by continuous distillation in one distillation column, the first fraction is continuously removed from the top of the column, the third fraction is continuously removed from the bottom of the column, and the second fraction is used as a side cut from the middle part of the distillation column. Remove fractions continuously.
• step 2 may be batch distillation using one distillation column. In that case, the first fraction and the second fraction are distilled in this order to obtain a distillate.
• the third fraction is obtained as a still liquid from the kettle or as a distillate by distilling after the first and second fractions are distilled.
• step 2 When step 2 is performed in two stages using two distillation columns, the first fraction is taken out from the top of the first distillation column and the intermediate fraction is taken out from the bottom of the first distillation column.
• the intermediate fraction is sent to the second distillation column and subjected to a distillation operation.
• the second fraction is taken out from the top of the second distillation column, and the third fraction is taken out from the bottom of the second distillation column.
• Each distillation performed in the first and second distillation columns may be continuous distillation or batch distillation.
• Step 2 may be performed by any method other than distillation.
• step 2 may be performed by extraction or membrane separation.
• Step 3 is a step in which a fluoroalkyl iodide having a polymerization degree n of (m ⁇ 1) contained in the second fraction obtained in Step 2 and TFE are reacted in the second reactor.
• Step 3 is a step of obtaining a mixture of fluoroalkyl iodides having a polymerization degree of m or more by a telomerization reaction of a low polymerization degree fluoroalkyl iodide whose polymerization degree n is one smaller than m.
• the type and molar ratio of the metal catalyst used in the second reactor are the same as the type and molar ratio of the metal catalyst described in relation to the first reactor. Also, the preferred molar ratio of fluoroalkyl iodide to TFE in the second reactor is the same as the preferred molar ratio of R f I to TFE described in connection with Step 1.
• Step 4 includes the second reaction mixture obtained in Step 3, which is represented by the formula (I), a fluoroalkyl iodide having a polymerization degree n of (m-1) or less or a mixture thereof, and tetrafluoroethylene.
• the second reaction mixture is an unreacted fluoroalkyl iodide in which n is (m ⁇ 1) or less or a mixture thereof, and n is (m + 1) or more.
• the fluoroalkyl iodide and tetrafluoroethylene are usually included.
• the second reaction mixture is represented by the formula (I), a fluoroalkyl iodide having a polymerization degree n of (m-1) or less or a mixture thereof, and a fourth fraction containing tetrafluoroethylene, and the formula (I And a fifth fraction containing a fluoroalkyl iodide having a degree of polymerization n of m and a mixture of fluoroalkyl iodides of formula (I) having a degree of polymerization n of (m + 1) or more. It is preferable to separate into 6 fractions.
• the fourth fraction is preferably returned to the second reactor.
• the fifth fraction is taken out as a product.
• Step 4 is carried out in the same manner as in Step 2 above for the second reaction mixture obtained in Step 3. Therefore, the detailed description regarding the conditions of the process 4 is omitted.
• the amount, separation method, and the like of other components included in each fraction in step 4 are the same as the amount, separation method, and the like of other components included in each fraction described in connection with step 2.
• Step 4 the third fraction separated in Step 2 above is subjected to Step 4 together with the second reaction mixture, whereby a fluoroalkyl iodide represented by the above formula (I) and having a polymerization degree n of m or more is used. It is preferable to supply this mixture to step 4. Thereby, the third fraction separated in step 2 can be reused.
• step 4 the fifth fraction containing a fluoroalkyl iodide represented by formula (I) and having a polymerization degree n of m is efficiently used. Obtainable.
• the fifth fraction which is the next stage fraction
• this cycle is defined as one cycle, and the next step fraction obtained in the cycle is further subjected to the same steps as the step 3 and the step 4, thereby reducing the cycle.
• P times (p represents an integer of 1 or more) may be repeated.
• the fifth fraction (fraction containing a fluoroalkyl iodide having a polymerization degree n of m), which is a fraction in the next stage, is obtained.
• the eighth fraction containing the fluoroalkyl iodide can be obtained.
• the 11th fraction containing a fluoroalkyl iodide whose degree of polymerization n is (m + 2) is a further fraction of the next stage. Can be obtained.
• This mixture of fluoroalkyl iodides is useful as a raw material for various chemical products, and is particularly suitable for producing fluorine-containing acrylic acid esters.
• R f — (CF 2 CF 2 ) n —H (wherein R f is a fluoroalkyl having 1 to 10 carbon atoms) 1 represents any one of the groups, and n is an integer indicating the degree of polymerization).
• the production method of the present invention includes a plurality of reactors, by reacting 1-iodoperfluoroethane (C 2 F 5 I), which has a slow reaction rate in the first reactor, with tetrafluoroethylene, 1-iodoperfluorobutane (C 4 F 9 I) was produced, and in another reactor, 1-iodoperfluorobutane (C 4 F 9 I) was reacted with tetrafluoroethylene to produce 1-iodoperfluorobutane (C 4 F 9 I).
• Example 1 As the first reactor, a stainless steel pressurized reactor having a capacity of 200 ml having a stirrer was prepared. To this, 200 g of 1-iodoperfluoroethane (C 2 F 5 I) as a telogen and 10 g of copper powder as a metal catalyst were charged and heated to 100 ° C. While maintaining the temperature in the reactor at 100 ° C., tetrafluoroethylene was supplied as taxogen, and the reaction mixture was stirred until the pressure in the reactor became 1.2 MPa (gauge pressure).
• C 2 F 5 I 1-iodoperfluoroethane
• This reaction mixture was distilled, 1124 g of 1-iodoperfluoroethane (C 2 F 5 I) (purity 99.9 mol%), 90 g of 1-iodoperfluorobutane (C 4 F 9 I) (purity 99.9 mol) %), 33 g of 1-iodoperfluorohexane (C 6 F 13 I) (purity 99.9 mol%) and 1-iodoperfluorooctane (C 8 F 17 I) were obtained.
• a stainless steel pressurized reactor having a capacity of 200 ml having a stirrer was prepared. To this was charged 90 g of 1-iodoperfluorobutane (C 4 F 9 I) obtained above as a telogen, and 4.5 g of copper powder as a metal catalyst. While heating so that the liquid phase temperature in the second reactor is 100 ° C., tetrafluoroethylene is supplied as taxogen, and the reaction mixture is stirred, and the pressure in the reactor is 0.35 MPa (gauge pressure). Pressurized until Since tetrafluoroethylene is consumed by the reaction, the telomerization reaction was carried out while appropriately adding tetrafluoroethylene so that the pressure was constant. When the total amount of tetrafluoroethylene supplied reached 3.3 g, the supply was stopped and cooled to obtain a second reaction mixture.
• C 4 F 9 I 1-iodoperfluorobutane
• the composition of the obtained first reaction mixture and second reaction mixture was analyzed by gas chromatography.
• Example 2 As the first reactor, a stainless steel pressurized reactor having a capacity of 200 ml having a stirrer was prepared. To this, 200 g of 1-iodoperfluoroethane (C 2 F 5 I) as a telogen and 10 g of copper powder as a metal catalyst were charged and heated to 100 ° C. While maintaining the temperature in the reactor at 100 ° C., tetrafluoroethylene was supplied as taxogen, and the reaction mixture was stirred until the pressure in the reactor became 1.2 MPa (gauge pressure).
• C 2 F 5 I 1-iodoperfluoroethane
• This reaction mixture was distilled, and 2085 g of 1-iodoperfluoroethane (C 2 F 5 I) (purity 99.9 mol%) and 116 g of 1-iodoperfluorobutane (C 4 F 9 I) (purity 99.9 mol) were obtained. %), 33 g of 1-iodoperfluorohexane (C 6 F 13 I) (purity 99.9 mol%) and 1-iodoperfluorooctane (C 8 F 17 I) were obtained.
• a stainless steel pressurized reactor having a capacity of 200 ml having a stirrer was prepared. This was charged with 116 g of 1-iodoperfluorobutane (C 4 F 9 I) obtained above as a telogen, and further with 5.8 g of copper powder as a metal catalyst. While heating so that the liquid phase temperature in the second reactor is 100 ° C., tetrafluoroethylene is supplied as taxogen, and the reaction mixture is stirred, and the pressure in the reactor is 0.35 MPa (gauge pressure). Pressurized until Since tetrafluoroethylene is consumed by the reaction, the telomerization reaction was performed while supplying tetrafluoroethylene as appropriate so that the pressure was constant. When the total amount of tetrafluoroethylene was 4.2 g, the supply was stopped and cooled to obtain a second reaction mixture.
• C 4 F 9 I 1-iodoperfluorobutane
• This reaction mixture was distilled and 100 g of 1-iodoperfluorobutane (C 4 F 9 I) (purity 99.9 mol%) and 13 g of 1-iodoperfluorohexane (C 6 F 13 I) (purity 99.9 mol) were obtained. %) And 1-iodoperfluorooctane (C 8 F 17 I) was obtained.
• the composition of the obtained first reaction mixture and second reaction mixture was analyzed by gas chromatography.
• Comparative Example 1 A stainless steel pressure reactor having a capacity of 200 ml with a stirrer was prepared. To this, 200 g of 1-iodoperfluoroethane (C 2 F 5 I) as a telogen and 10 g of copper powder as a metal catalyst were charged and heated to 120 ° C. While maintaining the temperature in the reactor at 100 ° C., tetrafluoroethylene was continuously supplied as taxogen, and the pressure in the reactor was increased to 1.20 MPa (gauge pressure) while stirring the reaction mixture.
• C 2 F 5 I 1-iodoperfluoroethane
• the composition of the obtained reaction mixture was analyzed by gas chromatography.
• the number of moles of 1-iodoperfluorohexane (C 6 F 13 I) having a degree of polymerization n 2 and the number of moles of fluoroalkyl iodide having a degree of polymerization n of 3 or more in the reaction mixture determined from the analysis results
• the reaction in the second reactor having a high reaction rate can be performed in the first reaction with a low reaction rate.
• the reaction can be carried out independently from the reaction in the reactor, and the selectivity of the target 1-iodoperfluorohexane (C 6 F 13 I) can be increased.

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